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# a1-1 - (b What is the initial rate of change of the...

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Chemistry 2000 Spring 2001 Section B Assignment 1 Due: Thursday, Jan. 18, 10:50 a.m. Note: I’m not terribly fussy about significant figures, but I will ask the marker to penalize answers which give either a ridiculously small or a ridiculously large number of digits relative to the number of significant figures of the data. 1. Calculate the mole fraction of potassium ions in a solution made by dissolving 8.0 g of potassium permanganate in 250 mL of water (measured at 20 C). The density of water at 20 C is 0.998 23 g/mL. [6 marks] 2. A 1.697 mol/L solution of acetone (CO CH 3 2 ) in water has a density of 0.9849 kg/L. (a) Calculate the molality of this solution. [8 marks] (b) Calculate the mole fraction of acetone. [4 marks] 3. Suppose that, for a reaction A 2B, the initial concentration of A is 0.400 mol/L. After 0.32 s, the concentration of A has dropped to 0.382 mol/L. (a) Determine the initial rate of change of the concentration of A from this data. [2 marks]
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Unformatted text preview: (b) What is the initial rate of change of the concentration of B? [2 marks] 4. In a pair of initial rate experiments, the rate of a reaction increases by a factor of 9 when the concentration of a reactant is increased by a factor of 3, all other factors being held constant. What is the order of the reaction with respect to this reactant? Briefly explain your reasoning. [3 marks] 5. In the reaction of ozone with nitrogen monoxide forming nitrogen dioxide and oxygen, the following initial rate data have been obtained: Experiment [NO] ( μ mol/L) [O 3 ] ( μ mol/L) d NO 2 dt ( μ molL 1 s 1 ) 1 1 00 3 00 66 2 1 00 6 00 132 3 1 00 9 00 198 4 2 00 9 00 396 5 3 00 9 00 594 (a) Determine the rate law and explain your reasoning. [8 marks] (b) Calculate the rate constant. [2 marks] (c) Calculate the rate of the reaction if NO 1 30 μ mol L and O 3 5 00 μ mol L. [2 marks]...
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